Just discovered this thread OMG!! There's actually other things to talk about than in the Broken Drum!!
Anyway, having read every post in this thread the one thing that stands out like the proverbial is what a clever author TP is! He has written a book for everyone to have an opinion about and introduced characters that everyone loves/hates. Some think that Rincewind is the funniest person in fiction others can't abide him. For my part I see him as just an element of the rich tapestry that is the Terry Pratchett legacy.
Having said that I do have a couple of observations. It's not hard to dislike Strata, Pyramids and the Dark Side Of The Sun as they are not really Discworld novels. Likewise, if you loved the DW scenario then you may be a little adverse to books that do not deal with that genre such as the Tiffany trilogy or Nation.
TP often makes me laugh out loud for a few minutes, giggle uncontrollably for some hours and make me smile for days. Sometimes just over a single paragraph.
Foe example the parrot in Eric "wossname, wossname, wossname" just cracked me up.
Gaspode's sarcasm to Laddie in Moving Pictures still makes me smile as I type this.
The fate of the 'willow pattern' painter in Interesting times was hilarious.
Nanny Ogg's irritating calmness while in the Dukes castle cell in Wyrd Sisters.
The Feegles sorting out the pussy cat in Wee Free Men was hysterically funny.
What didn't make me laugh at all was Outrageous Regiment which was bereft of humour and had a very obvious finale.
Nation is a staggeringly brilliant book that should never be judged against any other DW novel.